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Using Arduino to Create an Online Reactor Reactivity Meter 



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Using Arduino to Create an 
Online Reactor Reactivity Meter 

Written By: ben 



TOOLS: 



PARTS: 



Picoammeter or Current Amplifier or 
Electrometer or RateMeter (1) 



Cerebot MX7ck board. PLED Screen 
and USB cable to computer using UART 

in 



SUMMARY 

Inverse-kinetics is an equation that will calculate the reactivity value for the reactor (in terms 
of cents). The meter should start when the reactor is critical. 



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Using Arduino to Create an Online Reactor Reactivity Meter 



Step 1 — Using Arduino to Create an Online Reactor Reactivity Meter 

• To change the signal from a current 
chamber use a picoammeter or 
current amplifier. There is usually 
an analog voltage output for the 
range. The signal is usually 
inverted. Invert the signal using an 
op-amp. 

• For a pulse detector us a rate 
meter to obtain an output voltage. 
Some resistors may be required to 
change the 0-1 OV output to 0-3.3V. 

• Program the micro-controller to 
sample the voltage. Filtering the 
data is recommended 

• Use the inverse-kinetics equation 
to determine reactivity. 

• Filtering the reactivity output is 
also recommended. 

• For my project I sent the data out 
to an OLED screen for display and 
I also sent it to LabView where it 
can be stored. 




The code is attached in the documents. An additional header file was used to change a float to 
string. I got the header file from the Arduino playground. I'm sure there is a better way to do it 
but I couldn't figure it out because I'm new to C++. I also attached a picture of the labview 
program. The output from the micro-controller to the computer uses a comma to separate the 
reactivity value and timestamp. 

This document was last generated on 2012-11-03 03:26:36 AM. 



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